Critical severity · published Feb 13, 2026
CVE-2026-26190
Milvus Allows Unauthenticated Access to Restful API on Metrics Port (9091) Leads to Critical System Compromise
9.8
CVSS
39.3%
EPSS
No
On KEV
Description
Milvus is an open-source vector database built for generative AI applications. Prior to 2.5.27 and 2.6.10, Milvus exposes TCP port 9091 by default, which enables authentication bypasses. The /expr debug endpoint uses a weak, predictable default authentication token derived from etcd.rootPath (default: by-dev), enabling arbitrary expression evaluation. The full REST API (/api/v1/*) is registered on the metrics/management port without any authentication, allowing unauthenticated access to all business operations including data manipulation and credential management. This vulnerability is fixed in 2.5.27 and 2.6.10.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)39.3% · higher than 99% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MI
milvus · milvus-io
< 2.5.27; >= 2.6.0, < 2.6.10 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26190
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26190
Patch
https://github.com/milvus-io/milvus/commit/92b74dd2e286006a83b4a5f07951027b32e718a9
Product
https://github.com/milvus-io/milvus/releases/tag/v2.5.27
Product
https://github.com/milvus-io/milvus/releases/tag/v2.6.10
Exploit
https://github.com/milvus-io/milvus/security/advisories/GHSA-7ppg-37fh-vcr6
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milvus-io milvus Grantee ID Hash kv_catalog.go weak hash